Classifications

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• • A—HUMAN NECESSITIES
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Definitions

• the present invention relates to a system for administering pharmaceuticals by inhalation. More particularly the present invention relates to the use of lipids as part of the system.
• the pulmonary system is subject to many disorders. There is a continuing need to treat lung diseases such as pre-cancerous or cancerous conditions, damage caused by tobacco smoke and other environmental insults, inflammations and infections.
• the lungs can also be a portal to the body by means of uptake by cells of the lung such as aveolar macrophages or through the lymphatic system.
• Administration of drugs through the lung portal for systematic treatment can avoid hepatic first pass inactivation and allow for lower doses with fewer side effects.
• Lung disease is the number three killer in the United States, responsible for one in seven deaths.
• Significant lung diseases includes such illnesses as: asthma, lung cancer, chronic obstructive pulmonary disease (COPD, which includes emphysema and chronic bronchitis), influenza, pneumonia, tuberculosis, respiratory distress syndrome (RDS), cystic fibrosis, sudden infant death syndrome (SIDS), respiratory synctial virus (RSV), AIDS related lung diseases and sarcoidosis. Every year approximately 335,000 Americans die of lung disease. Lung disease not only causes death, but can result in chronic conditions such as asthma, emphysema and chronic bronchitis.
• COPD chronic obstructive pulmonary disease
• influenza influenza
• pneumonia tuberculosis
• RDS respiratory distress syndrome
• SIDS cystic fibrosis
• SIDS sudden infant death syndrome
• RSV respiratory synctial virus
• AIDS related lung diseases and sarcoidosis Every year approximately 335,000 Americans die of lung disease.
• the present invention can overcome these disadvantages in lung disease inhalation therapy, and more importantly it offers new advantages to inhalation that can enhance the therapeutic index of a currently used inhalation or i ⁇ jectable lung disease drug.
• the invention can be used for the successful entrapment and delivery of both low and high molecular weight compounds.
• the present invention provides for lipid- containing bioactive agents which can be administered by inhalation as part of a delivery system.
• a system for administering a bioactive compound by inhalation having: (a) a composition comprising the biologically-active compound and a lipid mixture; and
• lipid mixture having phosphatidylcholines: positively-charged lipids: sterol compounds in the molar ratio of 1-20:0.5-20:0.5-5. wherein the bioactive agent lipid mixture weight ratio is from 10:1 to 1:500.
• the present invention also includes the system wherein the lipid mixture includes:
• phosphatidylcholines negatively-charged lipids: sterol compounds: phosphatidylethanolamines of the molar ratios 1-20:1-10:0.5-5:1-10;
• phosphatidylcholines negatively-charged lipids: sterol compounds: albumin compounds in the molar ratio of 1-20:1-10:0.5-5:0.1-10;
• phosphatidylcholines negatively-charged lipids: sterol compounds: phosphatidylethanolamines: albumin compounds in the molar ratio of 1- 20:1-10:0.5-5:1-10:0.1-10;
• phosphatidylcholines negatively-charged lipids: albumin compounds: sterol compounds in the molar ratio of 1-20:1-10:0.1-10:0.5-5;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: sterol compounds in the molar ratio of 1-20:0.5-20:1- 10:0.5-5;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: albumin compounds in the molar ratio of 1 -20:0.5-20: 1 - 10:0.1-10;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: sterol compounds: albumin compounds in the molar ratio of 1-20:0.5-20:1-10:0.5-5:0.1-10; or
• phosphatidylcholines positively-charged lipids: albumin compounds: sterol compounds in the molar ratio of 1-20:0.5-20:0.1-10:0.5-5.
• the present invention includes a method wherein the system is employed for the treatment of a medical condition.
• compositions having lipids and bioactive agents can include liposomes, lipid complexes, lipid clathrates and proliposomes, i.e., compositions which can form liposomes in vitro or in vivo when contacted with water.
• Compositions are preferably adopted for use by inhalation, and more preferably for use in an inhalation delivery device for the composition's administration.
• the inhalation system can be used for the treatment of diseases in both man and animal, particularly lung disease.
• Bioactive agent and “biologically-active” are used interchangeably throughout the specification to describe materials, such as therapeutic, diagnostic and imaging agents, which exhibit biological activity or which can be used for imaging or diagnostic purposes, and which can be administered to living organisms, especially animals such as mammals, particularly humans.
• Bioactive agents include, but are not limited to: vitamins, hormones, antimetabolites and antimicrobial agents, such as antif ⁇ ingal agents, including polyene antifungals, antibacterial agents, including aminoglycosides, antiviral agents and antiparasitic agents.
• Bioactive agents also include proteins, peptides, ribo- and deoxyribonucleic acids, nucleotides, nucleosides, oligonucleotides, antihistaminic agents and neuropharmacologic agents, including sedatives.
• Bioactive agents further include steroidal and nonsteroidal anti-inflammatory agents, diuretic agents, antihypertensive agents, anti-arrhythmic agents, immunogens, immunomodulators, contraceptive agents, antiviral agents, vascular dilating agents, salicylic acid, resorcinol, phenol, retinoic acid, benzodiazepines, antipyretic agents, antispasmodics, anti-pruritic agents, sympathomimetics, decongestants, tranquilizers, anti-spasmodics, anti-emetics, sedatives and hypnotics, steroidal agents, progestational agents, local anesthetics and desensitizing agents, for example antigens and vaccines.
• Bioactive agents include vitamins, nutrients, such as amino acids, essential fats and minerals, retinoids and anti-neoplastic agents, including the anthracyclines and certain alkylating agents.
• Bioactive agents also include radiocontrast agents, such as the iodinated radiocontrast agents, for example, iotrolan, NMR contrast agents, radioisotopes, radiolabels and dyes.
• radiocontrast agents such as the iodinated radiocontrast agents, for example, iotrolan, NMR contrast agents, radioisotopes, radiolabels and dyes.
• the above-listed group of bioactive agents, among other agents, including their pharmaceutically acceptable salts are contemplated for use in the present invention. Determination of compatibilities of the above listed agents with, and the amounts to be utilized in, compositions of the present invention are within the purview of the ordinarily skilled artisan to determine given the teachings of this invention.
• the lipids used in the compositions of the present invention can be synthetic, semi-synthetic or naturally-occurring lipids, including phospholipids, tocopherols, sterols, fatty acids, glycoproteins such as albumin, negatively-charged lipids and cationic lipids.
• phosholipids they could include such lipids as egg phosphatidylcholine (EPC), egg phosphatidylglycerol (EPG), egg phosphatidylinositol (EPI), egg phosphatidylserine (EPS), phosphatidylethanolamine (EPE), and phosphatidic acid (EPA); the soya counte ⁇ arts, soy phosphatidylcholine (SPC); SPG, SPS, SPI, SPE, and SPA; the hydrogenated egg and soya counterparts (e.g., HEPC, HSPC), other phospholipids made up of ester linkages of fatty acids in the 2 and 3 of glycerol positions containing chains of 12 to 26 carbon atoms and different head groups in the 1 position of glycerol that include choline, glycerol, inositol, serine, ethanolamine, as well as the corresponding phosphatidic acids.
• EPC egg phosphati
• the chains on these fatty acids can be saturated or unsaturated, and the phospholipid may be made up of fatty acids of different chain lengths and different degrees of unsaturation.
• the compositions of the formulations can include DPPC, a major constituent of naturally-occurring lung surfactant.
• DMPC dimyristoylphosphatidylcholine
• DMPG dimyristoylphosphatidylglycerol
• DPPC dipalmitoylphosphatidylcholine
• DPPG dipalmitoylphosphatidylglycerol
• DSPC distearoylphosphatidylcholine
• DSPG distearoylphosphatidylglycerol
• DOPE dioleylphosphatidyl-ethanolamine
• PSPC palmitoylstearoylphosphatidyl-choline
• PSPG palmitoylstearolphosphatidylglycerol
• MOPE mono-oleoyl-phosphatidylethanolamine
• the sterols can include, cholesterol, esters of cholesterol including cholesterol hemi-succinate, salts of cholesterol including cholesterol hydrogen sulfate and cholesterol sulfate, ergosterol, esters of ergosterol including ergosterol hemi-succinate, salts of ergosterol including ergosterol hydrogen sulfate and ergosterol sulfate, lanosterol, esters of lanosterol including lanosterol hemi-succinate, salts of lanosterol including lanosterol hydrogen sulfate and lanosterol sulfate.
• the tocopherols can include tocopherols, esters of tocopherols including tocopherol hemi-succinates, salts of tocopherols including tocopherol hydrogen sulfates and tocopherol sulfates.
• the term "sterol compound” includes sterols, tocopherols and the like.
• the cationic lipids used can include ammonium salts of fatty acids, phospholids and glycerides.
• the fatty acids include fatty acids of carbon chain lengths of 12 to 26 carbon atoms that are either saturated or unsaturated. Some specific examples include: myristylamine, palmitylamine, laurylamine and stearylamine, dilauroyl ethylphosphocholine (DLEP), dimyristoyl ethylphosphocholine (DMEP), dipalmitoyl ethylphosphocholine (DPEP) and distearoyl ethylphosphocholine (DSEP), N-(2, 3- di- (9-(Z)-octadecenyloxy)-prop-l -yl-N, N, N-trimethylammonium chloride (DOTMA) and 1, 2-bis(oleoyloxy)-3-(trimethylammonio)propane (DOTAP).
• DLEP dilauroyl eth
• the negatively-charged lipids which can be used include phosphatidyl-glycerols (PGs), phosphatidic acids (PAs), phosphatidylinositols (Pis) and the phosphatidyl serines (PSs).
• PGs phosphatidyl-glycerols
• PAs phosphatidic acids
• Pro phosphatidylinositols
• PSs the phosphatidyl serines
• Examples include DMPG, DPPG, DSPG, DMPA, DPP A, DSPA, DMPI, DPPI, DSPI, DMPS, DPPS and DSPS.
• Phosphatidylcholines such as DPPC aid in the uptake by the cells in the lung (e.g., the alveolar macrophages) and helps to sustain release of the bioactive agent in the lung.
• the negatively charged lipids such as the PGs, PAs, PSs and Pis, in addition to reducing particle aggregation, are believed to play a role in the sustained release characteristics of the inhalation formulation as well as in the transport of the formulation across the lung (transcytosis) for systemic uptake.
• the sterol compounds are believed to affect the release characteristics of the formulation.
• the mole ratio of the lipids present in the lipid mixtures of the compositions of the present invention are:
• a first lipid mixture having phosphatidylcholines negatively-charged lipids: sterol compounds in the molar ratio of 1-20:1-10:0.5-5;
• a second lipid mixture having phosphatidylcholines negatively-charged lipids: albumin compounds in the molar ratio of 1-20:1-10:0.1-10;
• a third lipid mixture having phosphatidylcholines positively-charged lipids: phosphatidylethanolamines in the molar ratio of 1-20:0.5-20:1-10; 4. a fourth lipid mixture having phosphatidylcholines: negatively-charged lipids: phosphatidylethanolamines in the molar ratio of 1-20:1-10:1-10;
• a fifth lipid mixture having phosphatidylcholines positively-charged lipids: albumin compounds in the molar ratio of 1-20:0.5-20:0.1-10; or
• a sixth lipid mixture having phosphatidylcholines positively-charged lipids: sterol compounds in the molar ratio of 1-20:0.5-20:0.5-5.
• Lipid mixtures of the present invention also include:
• phosphatidylcholines negatively-charged lipids: sterol compounds: phosphatidylethanolamines of the molar ratios 1-20:1-10:0.5-5:1-10;
• phosphatidylcholines negatively-charged lipids: sterol compounds: albumin compounds in the molar ratio of 1-20:1-10:0.5-5:0.1-10;
• phosphatidylcholines negatively-charged lipids: sterol compounds: phosphatidylethanolamines: albumin compounds in the molar ratio of 1-20:1-10:0.5-5:1- 10:0.1-10;
• phosphatidylcholines negatively-charged lipids: albumin compounds: sterol compounds in the molar ratio of 1-20:1-10:0.1-10:0.5-5;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: sterol compounds in the molar ratio of 1-20:0.5-20:1- 10:0.5-5;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: albumin compounds in the molar ratio of 1-20:0.5-20:1- 10:0.1-10;
• phosphatidylcholines positively-charged lipids: phosphatidylethanolamines: sterol compounds: albumin compounds in the molar ratio of 1-20:0.5-20:1-10:0.5-5:0.1-10; or
• phosphatidylcholines positively-charged lipids: albumin compounds: sterol compounds in the molar ratio of 1-20:0.5-20:0.1-10:0.5-5.
• the bioactive agent lipid mixture weight ratio can vary from 10 : 1 to 1 : 500.
• the lipid mixtures when combined with bioactive agents are effective in producing formulations that can be used in inhalation device for administration to the lung.
• the lipids of a class which is present in the lipid mixture can be a single member of the class or two or more members of the class.
• the phosphatidylcholines can be a single PC such as DPPC or DPPC with one or more other PC's such as DMPC.
• the negatively-charged lipids can be PG, PA, PS or PI.
• lipid mixtures for the composition of the present invention is DPPC : DMPG : cholesterol at a 8.5 : 1.0 : 0.5 mole ratio.
• Another example can be DPPC : DMPG : albumin at a molar ratio of 8 : 1 : 2.
• Another specific lipid mixture is DPPC : DOPE : DMPG : cholesterol at a mole ratio of7 : 4 : 3 : 0.5.
• PE's such as DOPE, DMPE, DPPE, DSPE and MOPE can be employed in the lipid mixtures of the present invention.
• lipid mixtures particularly for use with biologically active compounds of high molecular weight (e.g., peptides, proteins, DNA, RNA, genes), a glycoprotein such as albumin or transferrin, referred to as an "albumin compound" can be present.
• the albumin compounds can be present at a mole ratio of 0.1 to 10 with respect to the other lipids.
• a lipid mixture can be DPPC : DMPG : albumin in a 8 : 1 : 2 mole ratio.
• the albumin can come from either natural , animal (e.g., human or bovine serum albumin) or synthetic sources.
• DOTAP DPPC : DOPE present in a mole ratio of 2 : 2 : 1.
• Other examples of a lipid mixture are DPPC : DOTAP : albumin in a molar ratio of 2:2:0.3; and DPPC : DOTAP : cholesterol in a molar ratio of 8:4:0.5.
• the bioactive agents can be a synthetic, semi-synthetic or naturally occurring compounds and include hydrophobic and hydrophilic compounds, compounds of low and high molecular weight (for example from 50 to 100 million Daltons), known drugs, therapeutics, peptides, proteins, DNAs, RNas, genes, and the like.
• the present invention includes lipid mixtures in which the molar ratio for any lipid component can be reduced by one-half its value.
• a “medical condition” is an illness, infection, physical or mental state, disease, inflammation or other medically-recognized disorder or syndrome.
• a medical condition include, but are not limited to, cancer, infection (including but not limited to bacterial, gram negative, mycobacterium, fungal, viral, AIDS, HIV and RSV), need for immune response suppression, prevention of coagulation, thrombosis or adverse platelet aggregation, need for a hormone, diabetes, osteoporosis, hypercalcimia, Paget's Disease, asthma, COPD, cardiovascular disease, hypertension, cardiac arrhythmia, inflammatory disease, pain, nausea, vomiting, smoking addiction, anaphylaxis, cystic fibrosis, Pneumocytyis carnii infection, tuberculosis and emphysema.
• Liposomes are completely closed lipid bilayer membranes containing an entrapped aqueous volume. Liposomes may be unilamellar vesicles (possessing a single membrane bilayer) or multilamellar vesicles (onion-like structures characterized by multiple membrane bilayers, each separated from the next by an aqueous layer).
• the bilayer is composed of two lipid monolayers having a hydrophobic "tail” region and a hydrophilic "head” region.
• the structure of the membrane bilayer is such that the hydrophobic (nonpolar) "tails" of the lipid monolayers orient toward the center of the bilayer while the hydrophilic "heads" orient towards the aqueous phase.
• Liposomes can be produced by a variety of methods (for a review, see, e.g., Cullis et al. (1987)). Bangham's procedure (J. Mol. Biol. (1965)) produces ordinary multilamellar vesicles (MLVs).
• MUVs multilamellar vesicles
• Lenk et al. U.S. Pat. Nos. 4,522,803, 5,030,453 and 5,169,637)
• Fountain et al. U.S. Pat. No. 4,588,57
• Cullis et al. U.S. Pat. No. 4,975,282 disclose methods for producing multilamellar liposomes having substantially equal interlamellar solute distribution in each of their aqueous compartments.
• Paphadjopoulos et al. U.S. Pat. No. 4,235,871 discloses preparation of oligolamellar liposomes by reverse phase evaporation.
• Unilamellar vesicles can be produced from MLVs by a number of techniques, for example, the extrusion of Cullis et al. (U.S. Pat. No. 5,008,050) and Loughrey et al. (U.S. Pat. No. 5,059,421)). Sonication and homogenization cab be so used to produce smaller unilamellar liposomes from larger liposomes (see, for example, Paphadjopoulos et al. (1968); Deamer and Uster (1983); and Chapman et al. (1968)).
• the original liposome preparation of Bangham et al. involves suspending phospholipids in an organic solvent which is then evaporated to dryness leaving a phospholipid film on the reaction vessel. Next, an appropriate amount of aqueous phase is added, the 60 mixture is allowed to "swell", and the resulting liposomes which consist of multilamellar vesicles (MLVs) are dispersed by mechanical means.
• MLVs multilamellar vesicles
• LUVs large unilamellar vesicles
• vesicles include those that form reverse- phase evaporation vesicles (REV), Papahadjopoulos et al., U.S. Pat. No. 4,235,871.
• REV reverse- phase evaporation vesicles
• Another class of liposomes that may be used are those characterized as having substantially equal lamellar solute distribution. This class of liposomes is denominated as stable plurilamellar vesicles (SPLV) as defined in U.S. Pat. No. 4,522,803 to Lenk, et al. and includes monophasic vesicles as described in U.S. Pat. No. 4,588,578 to Fountain, et al. and frozen and thawed multilamellar vesicles (FATMLV) as described above.
• SPLV stable plurilamellar vesicles
• FATMLV frozen and thawed multilamellar vesicles
• a bioactive agent such as a drug is entrapped in the liposome and then administered to the patient to be treated.
• a bioactive agent such as a drug
• U.S. Pat. No. 3,993,754 Sears, U.S. Pat. No. 4,145,410
• Paphadjopoulos et al. U.S. Pat. No. 4,235,871
• Schneider U.S. Pat. No. 4,224,179
• Lenk et al. U.S. Pat. No. 4,522,803
• Fountain et al. U.S. Pat. No. 4,588,578.
• the bioactive agent is lipophilic, it may associate with the lipid bilayer.
• the term "entrapment" shall be taken to include both the drug in the aqueous volume of the liposome as well as drug associated with the lipid bilayer.
• a liposome' s "size" is typically referred to in terms of its diameter, and can be measured by a number of techniques well known to ordinarily skilled artisans, such as quasi-electric light scattering.
• the liposomes generally have a diameter of greater than about 1 micron and up to 5 microns, preferably greater than 1 to 3 microns.
• Liposomes sizing can be accomplished by a number of methods, such as extrusion, sonication and homogenization techniques which are well known, and readily practiced, by ordinarily skilled artisans.
• Extrusion involves passing liposomes, under pressure, one or more times through filters having defined pore sizes.
• the filters are generally made of polycarbonate, but the filters may be made of any durable material which does not interact with the liposomes and which is sufficiently strong to allow extrusion under sufficient pressure.
• Preferred filters include "straight through” filters because they generally can withstand the higher pressure of the preferred extrusion processes of the present invention. "Tortuous path" filters may also be used.
• Extrusion can also use asymmetric filters, such as Anotec® filters (see Loughrey et al., U.S. Pat. No. 5,059,421), which involves extruding liposomes through a branched-pore type aluminum oxide porous filter.
• Anotec® filters see Loughrey et al., U.S. Pat. No. 5,059,421
• Liposomes can also be size reduced by sonication, which employs sonic energy to disrupt or shear liposomes, which will spontaneously reform into smaller liposomes. Sonication is conducted by immersing a glass tube containing the liposome suspension into the sonic epicenter produced in a bath-type sonicator. Alternatively, a probe type sonicator may be used in which the sonic energy is generated by vibration of a titanium probe in direct contact with the liposome suspension. Homogenization and milling apparatii, such as the Gifford Wood homogenizer, PolytronTM or Micro fluidizerTM, can also be used to break down larger liposomes into smaller liposomes.
• Homogenization and milling apparatii such as the Gifford Wood homogenizer, PolytronTM or Micro fluidizerTM, can also be used to break down larger liposomes into smaller liposomes.
• the resulting liposomes can be separated into homogeneous populations using methods well known in the art; such as tangential flow filtration (see WO 89/00846).
• tangential flow filtration see WO 89/00846
• a heterogeneously sized population of liposomes is passed through tangential flow filters, thereby resulting in a liposome population with an upper and/or lower size limit.
• liposomes smaller than the first pore diameter pass through the filter.
• This filtrate can the be subject to tangential flow filtration through a second filter, having a smaller pore size than the first filter.
• the retentate of this filter is a liposome population having upper and lower size limits defined by the pore sizes of the first and second filters, respectively.
• Liposomes are reported to concentrate predominately in the reticuloendothelial organs lined by sinosoidal capillaries, i.e., liver, spleen, and bone marrow, and phagocytosed by the phagocytic cells present in these organs.
• the therapeutic properties of many bioactive agents can be dramatically improved by the administration in a liposomally encapsulated form (See, for example, Shek and Barber (1986)). Toxicity can be reduced, in comparison to the free form of the drug, meaning that a higher dose of the liposomally encapsulated drug can safely be administered (see, for example, Lopez-Berestein, et al. (1985) J. Infect. Dis., 151 :704; and Rahman, et al. (1980) Cancer Res., 40:1532). Benefits obtained from liposomal encapsulation likely result from the altered pharmacokinetics and biodistribution of the entrapped drug.
• Liposomal encapsulation could potentially provide numerous beneficial effects for a wide variety of bioactive agents and a high bioactive agent to lipid ratio should prove important in realizing the potential of liposomally encapsulated agents.
• a “lipid complex” is an association between a bioactive agent and one or more lipids.
• the association can be by covalent or ionic bonding or by noncovalent interactions. Examples of such complexes include lipid complexes of amphotericin ⁇ and cardiolipin complexed with doxorubicin.
• a "lipid clathrate” is a three-dimensional, cage-like structure employing one or more lipids wherein the structure entraps a bioactive agent.
• Liposomes are formulations that can become liposomes upon coming in contact with an aqueous liquid. Agitation or other mixing can be necessary.
• the inhalation delivery device of the inhalation system can be a nebulizer, a metered dose inhaler (MDI) or a dry powder inhaler (DPI).
• MDI metered dose inhaler
• DPI dry powder inhaler
• the device can contain and be used to deliver a single dose of the lipid mixed - bioactive agent compositions or the device can contain and be used to deliver multi-doses of the compositions of the present invention.
• a nebulizer type inhalation delivery device can contain the compositions of the present invention as a solution, usually aqueous, or a suspension.
• the nebulizer type delivery device may be driven ultrasonically, by compressed air, by other gases, electronically or mechanically.
• the ultrasonic nebulizer device usually works by imposing a rapidly oscillating waveform onto the liquid film of the formulation via an electrochemical vibrating surface. At a given amplitude the waveform becomes unstable, whereby it disintegrates the liquids film, and it produces small droplets of the formulation.
• the nebulizer device driven by air or other gases operates on the basis that a high pressure gas stream produces a local pressure drop that draws the liquid formulation into the stream of gases via capillary action. This fine liquid stream is then disintegrated by shear forces.
• the nebulizer may be portable and hand held in design, and may be equipped with a self contained electrical unit.
• the nebulizer device can consist of a nozzle that has two coincident outlet channels of defined aperture size through which the liquid formulation can be accelerated. This results in impaction of the two streams and atomization of the formulation.
• the nebulizer may use a mechanical actuator to force the liquid formulation through a multiorifice nozzle of defined aperture size(s) to produce an aerosol of the formulation for inhalation.
• a metered dose inhalator can be employed as the inhalation delivery device of the inhalation system.
• This device is pressurized (pMDI) and its basic structure consists of a metering valve, an actuator and a container.
• a propellant is used to discharge the formulation from the device.
• the composition can consist of particles of a defined size suspended in the pressurized propellant(s) liquid, or the composition can be in a solution or suspension of pressurized liquid propellant(s).
• the propellants used are primarily atmospheric friendly hydroflourocarbons (HFCs) such as 134a and 227.
• HFCs atmospheric friendly hydroflourocarbons
• the device of the inhalation system may deliver a single dose via, e.g., a blister pack, or it may be multi dose in design.
• the pressurized metered dose inhalator of the inhalation system can be breath actuated to deliver an accurate dose of the lipid based formulation.
• the delivery of the formulation may be programmed via a microprocessor to occur at a certain point in the inhalation cycle.
• the MDI may be portable and hand held.
• a dry powder inhalator can be used as the inhalation delivery device of the inhalation system.
• This device's basic design consists of a metering system, a powdered composition and a method to disperse the composition. Forces like rotation and vibration can be used to disperse the composition.
• the metering and dispersion systems may be mechanically or electrically driven and may be microprocessor programmable.
• the device may be portable and hand held.
• the inhalator may be multi or single dose in design and use such options as hard gelatin capsules, and blister packages for accurate unit doses.
• the composition can be dispersed from the device by passive inhalation; i.e., the patient's own inspiratory effort, or an active dispersion system may be employed.
• the dry powder of the composition can be sized via processes such as jet milling, spray dying and supercritical fluid manufacture.
• Acceptable excipients such as the sugars mannitol and maltose may be used in the preparation of the powdered formulations. These are particularly important in the preparation of freeze dried liposomes and lipid complexes. These sugars help in maintaining the liposome' s physical characteristics during freeze drying and minimizing their aggregation when they are administered by inhalation.
• the sugar by its hydroxyl groups may help the vesicles maintain their tertiary hydrated state and help minimize particle aggregation.
• These three general types of inhalation delivery devices can also be used to deliver the vaccine compositions of the present invention.
• the inhalation system of the present invention can be used for the treatment of diseases in a number of therapeutic areas. These therapeutic areas include: infectious disease (anti-bacterial, anti-fungal and anti-viral activity), inflammatory disease (including arthritis, and hypertension), neoplastic disease (cancer), diabetes, osteoporosis, pain management and general cardiovascular disease. As discussed above the inhalation system may also be used in the treatment of lung disease.
• Lung disease includes: asthma, emphysema, lung cancer, chronic obstructive pulmonary disease (COPD), bronchitis, influenza, pneumonia, tuberculosis, respiratory distress syndrome, cystic fibrosis, sudden infant death syndrome (SDS), respiratory synctial virus (RSV), AIDS related lung diseases (e.g., Pneumocystis carinii pneumonia, Mycobacterium avium complex, fungal infections, etc.), sarcoidosis, sleep apnea, acute respiratory distress syndrome (ARDS), bronchiectasis, bronchiolitis, bronchopulmonary dysplasia, coccidioidomycosis, hantavirus pulmonary syndrome, histoplasmosis, pertussis and pulmonary hypertension.
• COPD chronic obstructive pulmonary disease
• bronchitis influenza, pneumonia, tuberculosis, respiratory distress syndrome, cystic fibrosis, sudden infant death syndrome (SDS), respiratory syn
• bioactive agents that can be present in the compositions of the inhalation system and the uses of the system in the treatment of disease include: sulfonamide, such as sulfonamide, sulfamethoxazole and sulfacetamide; trimethoprim, particularly in combination with sulfamethoxazole; a quinoline such as norfloxacin and ciprofloxacin; a beta- lactam compound including a penicillin such as penicillin G, penicillin V, ampiciUin, amoxicillin, and piperacillin, a cephalosporin such as cephalosporin C, cephalothin, cefoxitin and ceftazidime, other beta-lactam antibiotics such as imipenem, and aztreonam; a beta lactamase inhibitor such as clavulanic acid; an aminoglycoside such as gentamycin, amikacin, tobramycin, neomycin, kana
• bioactive agents that can be present in the compositions of the inhalation system and the uses of the system in the treatment of disease include: a methylxanthine such as theophylline; cromolyn; a beta- adrenginic agonist such as albuterol and tetrabutaline; a anticholinergic alkaloid such as atropine and ipatropium bromide; adrenocortical steroids such as predisone, beclomethasone and dexamethasone for asthma or inflammatory disease; the anti-bacterial and antifungal agents listed above for anti- bacterial and anti-fungal infections in patients with lung disease (these are the specific diseases listed above in what lung disease includes), in particular this includes the use of aminoglycosides (e.g., amikacin, tobramycin and gentamycin), polymyxins (e.g., polymyxin E, colistin), carboxycillin (ticarcillin) and monobactam
• the pharmaceutical formulation of the inhalation system may contain more than one pharmaceutical (e.g., two drugs for a synergistic effect).
• composition of the pharmaceutical formulation of the inhalation system may contain excipients(including solvents, salts and buffers), preservatives and surfactants that are acceptable for administration by inhalation to humans or animals.
• the particle size of the pharmaceutical formulations developed for use in the inhalation system can vary and be between 0.5 and 10 microns, with a range of 1 to 5 microns being best suited for inhalation.
• the particle size of the formulations can be established either prior to their filling into the inhalation delivery device of the inhalation system; or depending upon its design, the inhalation delivery device may size the particles.
• the pharmaceutical formulation of the inhalation system may be present as a powder, a liquid, or as a suspension.
• the inhalation system can also be used for the administration of vaccines.
• the vaccine's composition would consist of the lipids discussed above in the presented mole composition ratios and a biologically active antigen(s).
• the lipid: antigen mole ratio could be from 1,000,000 : 1 to 1 : 100.
• the inhalation system would consist of the lipid based vaccine formulation and the inhalation delivery device.
• the vaccine inhalation systems may be used in the preventive (i.e., prophylactic) and actual treatment of the diseases described above, particularly lung diseases like, influenza, pneumonia, RSV, tuberculosis, etc.
• the vaccine formulation may contain excipients(including solvents, salts and buffers), preservatives and surfactants that are acceptable for administration by inhalation to humans or animals.
• the vaccine formulation could contain more than one antigen.
• treatment means administering a composition to an animal such as a mammal or human for preventing, ameliorating, treating or improving a medical condition.
• the doses of a bioactive agent will be chosen by a physician based on the age, physical condition, weight and other factors known in the medical arts. Generally for bioactive agents, the dosages will be within the same employing the present invention as for the free drug.

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